#include <sys/types.h>#include <unistd.h>int _llseek(unsigned int fd, unsigned long offset_high,unsigned long offset_low, loff_t *result,unsigned int whence);Note: There is no glibc wrapper for this system call; see NOTES.

The _llseek() function repositions the offset of the open file
description associated with the file descriptor fd to
(offset_high<<32) | offset_low bytes relative to the beginning of the
file, the current file offset, or the end of the file, depending on
whether whence is SEEK_SET, SEEK_CUR, or SEEK_END, respectively. It
returns the resulting file position in the argument result.
This system call exists on various 32-bit platforms to support
seeking to large file offsets.

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Linux 2017-09-15 LLSEEK(2)